JPS6253364B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an air conditioning system for automobiles, and in particular, it has a reheat air mix type air conditioning mechanism and directs conditioned cold and hot air to the upper part of the vehicle interior (the upper body of the passenger).
The present invention also relates to an air conditioner for an automobile having two air outlets that emit air separately downward (at the feet of an occupant). According to the conventional temperature control device in this type of automotive air conditioner, it has not been possible to create a temperature difference between the cold and hot air blown out from the upper outlet and the cold and hot air blown out from the lower outlet. In order to solve this problem, for example, as shown in Japanese Utility Model Publication No. 52-9704, the temperature-controlled air was appropriately distributed to the upper outlet (cold air outlet) and the lower outlet (warm air outlet). In a product, a portion of the cold air that has passed through the evaporator is directly introduced into the cold air duct leading to the upper air outlet, and the cold air is mixed with the conditioned air passing through the cold air duct to create a temperature difference in the conditioned air blown out from both outlets. something is known. In addition, as shown in Publication No. 48-9781,
A cold air passage is provided upstream of the heater core to guide part of the cold air sent from the blower to the upper air outlet, and a part of the temperature-controlled warm air is introduced into this cold air passage to direct the cold air towards the upper air outlet. A device is known that mixes temperature-controlled warm air to create a temperature difference between the conditioned air blown out from an upper outlet and a lower outlet. However, in the former case, in order to control the conditioned air blown out from the upper and lower outlets to various temperatures,
Three dampers, ie, a mix damper, an outlet selection damper, and a cold air damper, are required, making the unit large and the control mechanism complicated. The latter not only requires four dampers, namely a temperature control valve that adjusts the temperature of the hot air after passing through the heat exchanger, a temperature control valve (two pieces) for the cold air blown out from the cold air outlet, and a wind shutoff valve. However, it is not possible to obtain a mode in which all of the cold air is blown out from the cold air outlet, and the configuration is unsuitable for an air conditioner equipped with a cooling device. The first object of the present invention is to obtain an air conditioner for an automobile of this type that can control the conditioned air blown out from the upper outlet and the lower outlet to maintain a predetermined temperature difference. A feature of the first invention of the present application is that two cold air passages bypassing the heater core and two hot air passages are provided downstream of the heater core, and the one cold air passage and the one hot air passage are merged. A first air outlet that communicates with the upper air outlet, merges the other cold air passage and the other hot air passage, communicates with the lower air outlet, and further controls the temperature of the conditioned air blown out from the upper air outlet. An air mix door and a second air mix door that controls the temperature of the conditioned air blown out from the lower outlet are provided, and a control mechanism that controls the second air mix door according to a control state of the first air mix door. At the point. A second object of the present invention is to compactly arrange two air mix doors in a unit case to control conditioned air passing through the upper blow-off duct and conditioned air passing through the lower blow-off duct. The second aspect of the present invention is characterized in that the air inflow and outflow surfaces of the heater core are installed opposite to each other with first and second gaps on the inner wall of the duct, and the first gap is connected to the first cold air passage and the second The gap is used as a second cold air passage, and first and second hot air passages are provided on the outflow surface side of the heater core to separate hot air flowing out from the heater core, and the first cold air passage and the first cold air passage are provided. The second hot air passage and the first hot air passage are merged and communicated with the upper air outlet, and the second cold air passage and the first hot air passage are merged and communicated with the lower air outlet, and the first gap is formed. A first air mix door is installed within the gap to control a split ratio of cold air flowing into the first cold air passage and cold air flowing into the heater core, and a first air mixing door is installed within the second gap to control a split ratio of cold air flowing into the first cold air passage and cold air flowing out from the second cold air passage. The second air mix door is provided to control the mixing ratio of the cold air and the hot air flowing out from the first hot air passage. An embodiment of the first invention of the present application will be described below based on the drawings. The evaporator 2 cools vehicle interior air, outside air, or a mixture of the two, which is sent by a blower (not shown). The heater core 3 is a heater core that heats the cold air that has been cooled and dehumidified by the evaporator 2. Evaporator 2 and heater core 3 are in that order.
Installed in duct A. The heater core 3 is supported by an upper partition wall 3-1 and a lower partition wall 3-2 provided in the duct A. There is a main cold air passage 9 between the wall 3-1 and the duct inner wall.
A is formed, and a sub-cool air passage 9b is formed between the lower partition wall 3-2 and the inner wall of the duct. Cold air passages 9a, 9b
The flow is divided into two parts at a ratio of 8:2. The first air mix door 5a controls the amount of cold air flowing into the heater core 3 and the amount of cold air flowing into the main cold air passage 9a. The first air mix door 5a is fixed to a shaft 51 rotatably provided at the end of the heater core 3 on the side of the main cold air passage on the cold air inflow surface. The first air mix door 5a rotates between a solid line position in the drawing, where the main cold air passage 9a is fully closed, and a broken line position, where the inflow surface of the heater core 3 is fully closed. The control door 5b divides the hot air flowing out from the heater core 3 into the main hot air passage 8a and the auxiliary hot air passage 8b at an appropriate ratio. The control door 5b includes a shaft 52 rotatably supported on the duct A and a door fixed to the shaft 52. The control door 5b rotates between the solid line position in the drawing and the broken line position in the drawing, and connects the main hot air passage 8a and the sub hot air passage 8b.
and the passage area is controlled within that range. The second air mix door 5c controls the mixing ratio of the hot air flowing out from the main hot air passage 8a and the cold air flowing out from the sub cold air passage 9b. The second air mix door 5c is composed of a shaft 53 rotatably supported at the end of the heater core 3 on the hot air outflow side facing the auxiliary cold air passage 9b, and a door plate fixed to the shaft 53. The second air mix door 5c rotates between the solid line position in the drawing and the broken line position in the drawing to control the mixing ratio of the hot air from the main hot air passage 8a and the cold air from the sub cold air passage 9b. The cold air duct 7a mixes the cold air that has passed through the main cold air passage 9a and the warm air that has passed through the auxiliary hot air passage, and guides the mixed air to the upper air outlet 20. The hot air duct 7b mixes hot air from the main hot air passage 8a and cold air from the auxiliary cold air passage 9b and guides the mixture to the lower outlet 21. The operating principle of the present invention will be explained below. When the first and second air mix doors 5a, 5c and the control door 5b are in the solid line positions in FIG. 1, the interior of the vehicle is in the maximum heating state. That is, the inside/outside air introduction door (not shown) switches to outside air introduction, the blower rotates at high speed, and the cooling device is stopped. All of the outside air that has passed through the evaporator 2 (which has no cooling effect) flows into the heater core 3 and is heated, passes through the main hot air passage 8a and the auxiliary hot air passage 8b, and then passes through the hot air duct 7b and the cold air duct 7a, respectively. It is blown out to the lower outlet 21 and the upper outlet 20. When the first air mix door 5a is moved little by little toward the broken line side while the control door 5b and the second air mix door are fixed in their positions, the main cold air passage 9 is moved.
The amount of cold air flowing into the cold air duct 7a through a gradually increases. As a result, the temperature of the conditioned air blown out from the upper outlet gradually becomes lower than the temperature of the warm air blown out from the lower outlet. Therefore, the entire interior of the vehicle can be heated while supplying appropriately temperature-controlled cold air from the upper air outlet. In particular, when the partition wall 5b is configured with a control door as in the embodiment, if this door is moved to the side of the broken line, the temperature of the cold air blown out from the upper outlet even if the amount of cold air flowing through the main cold air passage 9a is kept constant. can be lowered. When the control door 5b completely closes the auxiliary hot air passage, the temperature difference between the cold and hot air blown out from the upper air outlet 20 and the lower air outlet 21 becomes maximum. If you want to lower the temperature at your feet a little, move the second air mix door 5c toward the dotted line position, the amount of hot air from the main hot air passage 8a will decrease, and the amount of cold air from the auxiliary cold air passage will increase, causing the blowout to reach the outlet. The temperature of the harmonized warm air blown out from 21 decreases. If it is desired to lower the temperature of the entire vehicle interior during heating, the first air mix door 5a is further moved to the dotted line position, and the rotational speed of the blower is accordingly lowered. In this way, the amount of cold air flowing into the heater core 3 is reduced, and the amount of hot air itself flowing out to the main and sub hot air passages is also reduced, and the air flows through the main cold air passage 9a to the upper air outlet 20.
Since the amount of cold air blown from the room increases, the indoor heating effect can be reduced as a result. During dehumidification and heating, half of the air inside the vehicle and half of the air from outside the vehicle are sucked in. Even in this state, the temperature of the conditioned air blown out from the upper air outlet 20 and the lower air outlet 21 can be controlled by controlling the opening degrees of the first and second air mix doors 5a and 5c. In addition, the first and second air mix doors 5a, 5c
By fixing the control door 5b at an intermediate position and controlling the opening degree of the control door 5b, the temperature of both the conditioned air blown out from the upper outlet 20 and the lower outlet 21 can be controlled simultaneously. During cooling, the flow of hot water to the heater core 3 is stopped, and the first air mix door 5a moves to the position shown by the broken line in the figure. Therefore, all the cold air cooled by the evaporator 2 passes through the main cold air passage 9a and is blown out from the upper outlet 20. However, when the second air mix door 5c moves toward the position indicated by the broken line in the drawing, a portion of the cold air flows into the sub-chill air passage 9b.
The air is also blown out from the lower air outlet 21 through the air outlet 21 . The first and second air mix doors 5a and 5c may be operated independently, or the opening degree of the second air mix door 5c may be controlled according to the opening degree of the first air mix door 5a, or both upper and lower air mix doors may be operated independently. Both air mix doors can also be electrically controlled according to the temperature difference so that the temperature difference of the conditioned air blown out from the outlet has a predetermined characteristic. This point will be explained in detail in specific examples described below. Furthermore, even if the control door 5b is controlled independently,
Or the first and second air mix doors 5a, 5c
The control may be performed depending on the opening degree of at least one of the following. Next, one embodiment of the present invention will be explained in detail based on FIG. Components with the same reference numerals as in FIG. 1 are the same, so their explanation will be omitted. 1 is a blower motor, 101 is its fan,
4 is a door for switching between inside and outside air; 41 and 42 are inside air intake ports formed in duct A that lead to the interior of the vehicle;
This is an outside air inlet that leads to the outside of the vehicle. The heater 3 is installed so that the air inflow and outflow surfaces face the inner surface of the duct A, and the space formed between the inflow surface and the duct inner surface forms a main cold air passage 9a, and the air outflow surface and the duct inner surface form a main cold air passage 9a. The space formed between them forms a sub-cool air passage 9b. The first air mix door 5a has a shaft 51 provided at a corner of the heater core 3 on the outlet side of the main cold air passage 9a, and is installed so as to rotate between the inflow surface of the heater core 3 and the inner wall of the duct A. The second air mix door 5c has a shaft 53 provided at a corner of the heater core 3 on the inlet side of the sub-cool air passage 9b, and is rotatably installed between the outflow surface of the heater core 3 and the inner wall of the duct. By installing two air mix dampers in this way, the air volume in each passage can be controlled without making the angle from fully closed to fully open the air mix door very large, so the air conditioner can be made more compact. 50 is a partition wall provided on the outflow surface side of the heater core 3, which separates the flow path of the outflowing hot air into the main hot air path 8a,
The air is divided into the sub-hot air passage 8b. The shaft 52 of the control door 5b is supported on the duct at the exit of the auxiliary hot air passage 8b so that the tip of the control door 5b can rotate between the tip of the partition wall 50 and the corner of the heater core 3 facing the auxiliary hot air passage 8b. has been done. D is a branch port to the defroster that opens into the hot air duct 7b, and the branch port is provided with an outlet switching door to select whether to blow hot air to the defroster port 22 or to the lower outlet 21. select. An actuator 31 operates the first air mix door 5a, and includes a diaphragm (not shown) that operates under negative pressure, a rod 311 connected at one end to the diaphragm, and a negative pressure control valve 312 that controls the negative pressure acting on the diaphragm. It consists of 32 is an actuator that operates the second air mix door 5c, and is connected to a diaphragm chamber (not shown) partitioned by a diaphragm, a rod 321 fixed to the diaphragm, and a negative pressure control valve 322 that controls the negative pressure acting on the diaphragm. configured. The negative pressure control valves 312 and 322 have electromagnetic valves S1 and S3 that switch between applying atmospheric pressure or negative pressure to the diaphragm chamber.
3 is energized, negative pressure is applied to the diaphragm chamber, and the doors 5a, 5c are pulled toward the actuator by the rods 311, 321. When the power to the solenoid valves S1 and S3 is cut off, the negative pressure that had been applied to the diaphragm chamber leaks to the atmosphere, and the spring, which had been compressed by the diaphragm on which the negative pressure was applied, expands and the rod 31
1, 321, the doors 5a, 5c are pushed back toward the heater core 3 side. Thus, when the doors 5a, 5c come to the predetermined positions, the solenoid valves S2, S4 are operated to close both the atmospheric and negative pressure passages leading to the diaphragm chamber, and the pressure inside the diaphragm chamber does not change, and the doors 5a,
5c is fixed in that position. An actuator 33 operates the control door 5b, and is composed of a diaphragm (not shown), a rod 331 fixed to the diaphragm, and a negative pressure control valve 332 that controls the negative pressure applied to the diaphragm. The negative pressure control valve 332 includes an electromagnetic switching valve S5. When the solenoid switching valve S5 is not energized by the power source, the diaphragm is moved to the second position by a spring (not shown).
The door 5b is pushed upward in the drawing, and as a result, the door 5b is moved via the rod 331 to the position indicated by the broken line in the drawing. When the electromagnetic switching valve S5 is energized by the power source, it is pulled downward in FIG. 2 by the negative pressure applied to the diaphragm, and as a result, the door 5 is
b is moved to the solid line position in the figure. 34 is an actuator that operates the inside/outside air switching door 4, and includes a diaphragm (not shown), a rod 341 fixed to the diaphragm, and a negative pressure control valve 342 that controls the negative pressure applied to the diaphragm.
It consists of The negative pressure switching valve 342 includes electromagnetic valves S6 and S7. Further, there are two diaphragms, and the two diaphragms are installed at an interval in the axial direction of the rod 341. When both solenoid valves S6 and S7 are not energized by the power supply, both diaphragms are pushed to the left in the drawing by their respective springs, and the door 4 is pushed to the left by the rod 3.
41 to the position indicated by the broken line in the drawing. When the electromagnetic valve S6 is energized, a negative pressure is applied to one diaphragm, and the diaphragm is attracted to the right in the drawing while compressing the spring, and the door 4 is pulled by the rod 341 to the position shown in the dashed line in the drawing. When the solenoid valve S7 is further energized, both diaphragms are further attracted to the right in the drawing while compressing another spring, and as a result, the door 4 is moved to the position shown by the solid line in the drawing. These electromagnetic valves S1 to S7 are controlled by control outputs from a control circuit C including a microcomputer. SP is a rheostat resistance used by the crew to adjust the set temperature Ts. The target vehicle interior temperature Tso is the set temperature Ts, the outside temperature T _A detected by the outside temperature sensor SA, and the solar radiation sensor SF.
It is calculated using the following calculation formula programmed into the ROM of the microcomputer based on the amount of solar radiation Q detected at . Tso = Ts - α (T _A -25) - 2/660Q ... (1) (However, the unit of target temperature Tso and outside temperature T _A is [℃], and the value of α is when the outside temperature T _A is 25℃ or more. 1/5 when the outside temperature is 25℃ or less, and 1/15 when the outside temperature is below 25℃, and the amount of solar radiation Q [kcal/
h] is 20 per 1°C difference between the temperature T _Q detected by the solar radiation sensor SF and the temperature T _R detected by the vehicle interior air temperature sensor S _R.
Use the value converted as the amount of heat in [kcal/h]. ) The target temperature inside the warm air duct 7b is determined from the target temperature Tso, the outside temperature T _A , the footwell temperature T _L detected by the inside temperature sensor Sc in the lower part of the vehicle compartment, and the temperature Td _L detected by the sensor SE inside the warm air duct 7b. The hot air temperature Td _LO is calculated using the following formula. T _SOL = Tso + 70 - Ta / 18 ... (2) (However, T _SOL is the target temperature at the foot of the vehicle interior) ΔT _L = T _SOL - T _L ... (3) Td _LO = 6 (ΔT _L + 1/680∫ ΔT _L・dt)+30... (4) (However, when Td _LO ≦0 [℃], Td _LO = 0
[°C], when Td _LO ≧60 [°C], Td _LO = 60 [°C]
shall be. ) Then, the target opening degree θ _L of the second air mix door 5c to obtain the target hot air temperature Td _LO is calculated by the following equation. ΔTd _LO = Td _LO −Td _L ……(5) θ _L = 3×ΔTd _LO +15 ……(6) (However, when θ _L ≦0 degrees, θ _L = 0 degrees, θ _L ≧
When the angle is 30 degrees, θ _L =30 degrees. When in defroster mode, θ _L =30 degrees. ) The opening degree of the door 5c is set to 0 degrees at the solid line position in the figure. The current opening position of the door 5c is determined by the potentiometer.
It is detected by PM2, and by comparing it with the target opening degree θ _L , it is determined in which direction the door 5c should be moved from its current position. Accordingly, it is determined whether or not to energize the solenoid valve S3. For example, if it is determined that the opening degree needs to be narrowed from the current position (assumed to be at the position indicated by the broken line in the figure), first the solenoid valve S3 is deenergized, and then the solenoid valve S4 is deenergized.
deactivate. Then, the negative pressure applied to the diaphragm leaks to the atmosphere, and the door 5c moves toward the heater core. The changing opening degree of the door 5c is detected moment by moment by the potentiometer PM2, and is detected by the potentiometer PM2, which is stored in the write-erasable memory (RAM) in the microcomputer.
is memorized. The current opening degree stored in the RAM and the target opening degree are periodically compared, and when they match, the solenoid valve S4 is energized and the door 5c is fixed at that position. On the other hand, if it is determined that the opening degree needs to be increased from the intermediate position, first the solenoid valve S3 is energized, and then the solenoid valve S4 is deenergized. Then, negative pressure is applied to the diaphragm and the door 5c
is pulled toward the actuator. When the opening degree of the door 5c reaches the target opening degree, the solenoid valve S
4 is energized (while the solenoid valve S3 is deenergized), and the door 5c is fixed in that position. On the other hand, based on the target temperature Tso, the outside temperature T _A , the upper body temperature T _U detected by the upper interior temperature sensor S _B and the cold air duct internal temperature Td _U detected by the sensor SD in the cold air duct 7a, the cold air The target cold air temperature Td _LO in the duct 7a is calculated by the following equation. T _SOU = Tso + Ta - 70/18 ... (7) (However, T _SOU is the upper body temperature target value) ΔT _U = T _SOU - T _U ... (8) Td _UO = 3 (ΔT _U + 1/680∫ΔT _U・dt)+15... (9) (However, when Td _UO ≦0 [℃], Td _UO =
0 [℃], Td _UO ≧30 [℃], Td _UO =
The temperature shall be 30 [℃]. ) Then, the target opening degree θ _U of the first air mix door 5a to obtain the target cold air temperature Td _UO is calculated by the following equation. ΔTd _UO = Td _UO −Td _U ……(10) θ _U = 3×ΔTd _UO +15 ……(11) (However, when θ _U ≦0 degrees, θ _U = 0 degrees, θ _U ≧
When the angle is 30 degrees, θ _U =30 degrees. Furthermore, in the defroster mode, θ _U =30 degrees. ) Note that the opening degree of the door 5a is set to 0 degrees at the solid line position in the figure. The current opening position of the door 5a is detected by the potentiometer PM1, and by comparing it with the target opening θ _U , it is determined in which direction the door 5a should be moved from the current position. Accordingly, it is determined whether or not to energize the solenoid valve S1. For example, if it is determined that the opening degree needs to be narrowed from the current position (assumed to be at the position indicated by the broken line in the figure), first the solenoid valve S1 is deenergized, and then the solenoid valve S2 is deenergized.
deactivate. Then, the negative pressure applied to the diaphragm leaks to the atmosphere, and the door 5a moves toward the heater core. The changing opening degree of the door 5a is momentarily detected by the potentiometer PM1 and stored in a rewritable memory (RAM) in the microcomputer. The current opening degree stored in RAM is periodically compared with the target opening degree, and when both opening degrees match, a control output is output from the control circuit C to energize the solenoid valve S2 based on a command from the microcomputer. and solenoid valve S
2 is energized, the door 5a stops at that position. In this way, the cold and hot air blown out from the cold air outlet 20 located on the upper body side and the warm air outlet located on the foot side are controlled to a desired temperature according to the set temperature (target vehicle interior temperature). When the target opening degree θ _L of the second air mix door 5c read into the RAM in the microcomputer reaches θ _L ≧25 degrees, or when the operation mode becomes defroster mode, the command is sent from the control circuit C based on the command from the microcomputer. A control output that deenergizes the solenoid valve S5 is output, and when the solenoid valve S5 is deenergized, the control door 5b moves to the position shown by the broken line, and the hot air outflow surface of the heater core all opens into the hot air duct 7b. When the detected temperature TR of the indoor temperature sensor SR, the target vehicle interior temperature Tso, and the target opening degree θ _U of the first air mix door 5a written in the RAM in the microcomputer satisfy the following conditions, the microcomputer Control circuit C
A control output for energizing the electromagnetic valves S6 and S7 is outputted from the controller, and the door 4 is switched to the inside air introduction side. When T _R ≧Tso and θ _U =0゜...(12) Also, when each of the above values satisfies the following conditions, the control circuit C energizes the solenoid valve S6 in response to a command from the microcomputer, and S7 A control output is output to deenergize the door 4, and the door 4 is switched to an intermediate position where half of the inside and outside air are introduced. (a) T _R < Tso and θ _U = 0 degree... (13) (b) θ _U ≠ 0 degree and Tso < T _R ... (14) Furthermore, when each of the above values satisfies the following conditions: , a control output for deenergizing the solenoid valves S6 and S7 is output from the control circuit C according to a command from the microcomputer,
The door 4 is switched to the outside air introduction side. (a) When θ _U ≠ 0 degrees and Tso > T _R ... (15) (b) When the compressor is stopped (c) When in defroster mode In addition, the voltage is applied to the blower motor 1 by the output of the control circuit C based on the command from the microcomputer. The voltage is controlled as shown in Table 1 to control the amount of air blown and the drive stop.

[Table] Furthermore, the drive stoppage of the cooling device (compressor) is controlled as shown in Table 2 by the output of the control circuit C based on the command from the microcomputer.

[Table] In addition, the opening and closing of the hot water valve (not shown) is controlled by the control circuit C based on commands from the microcomputer as shown in Table 3.
controlled by the output of

[Table] In the first embodiment, the opening degrees of the first and second air mix doors are set at the set temperature (target vehicle interior temperature Tso).
The target opening degree was calculated and controlled using independent calculation formulas programmed into a microcomputer based on various temperature information. However, the air conditioner according to the present invention has the following features:
It is also possible to mechanically interlock the second air mix door and control the cold and hot air blown out from the cold air outlet and the hot air outlet to a predetermined temperature difference using a single operating lever. This second embodiment will be explained in detail below with reference to FIG. Components with the same reference numerals as those in FIG. 2 indicate the same components, so a description thereof will be omitted. Reference numeral 11 denotes a rod conductor wire, one end of which is connected to the first air mix door 5a, and the other end connected to an operating lever 13 provided on the operating panel section. When the operating lever 13 is operated toward the WARM side, the first air mix door 5a moves in a direction in which θ _U increases and the passage area of the main cold air passage 9a decreases. When the lever 13 is operated to the cool side, the opposite occurs. Clamps 12a and 12b support the rod transmission wire 11. 10 is a link mechanism, one end of which is rotatably engaged with the first air mix door 5a. On the other hand, the shaft 5 of the second air mix door 5c
3, a lever 5d extending toward the side opposite to the door is firmly fixed. The other end of the link mechanism 10 is rotatably connected to the tip of the lever 5d. Therefore, when the operating lever 13 is operated on the first air mix door 5a in the direction in which θ ₂ becomes larger, the second air mix door 5c moves in the direction in which θ _L becomes larger. That is, the link 10 and the first air mix door 5a
The connection point P with the shaft 51 draws an arc upwardly about the center of rotation of the shaft 51, and as a result, the other end of the link 10 pulls the tip of the lever 5d upward. Since the lever 5d is fixed to the shaft 53, when the tip of the lever 5d is pulled upward, the shaft 53 rotates clockwise, and as a result, the shaft 5
The second air mix door 5c fixed to 3
rotates downward in the drawing around the shaft 53. In this way, the second air mix door is controlled to an opening degree that corresponds to the opening degree of the first air mix door. FIG. 4 shows experimental data of temperature changes at the upper cold air outlet and the lower warm air outlet when θ _U and θ _L are varied. The vertical axis is temperature [℃], and the horizontal axis is the opening angle of each air mix door (however, the position of the broken line is 0 degrees) θ
_U and θ _L [degrees] are shown. Graph HIN shows the change in heater inlet temperature,
HOUT indicates the temperature change at the heater outlet. In addition, the graph DOWN shows the temperature change of the harmonized warm air blown out from the lower hot air outlet, and the graph UP shows the temperature change of the harmonized cold air blown out from the upper cold air outlet. In addition, S/V measures the temperature change of the harmonized cold air blown out from the side belt outlets installed on both sides of the vehicle interior instrument panel among the upper cold air outlets.
V indicates the temperature change of the harmonized cold air blown out from the center vent provided in the center. Further, the graph EV shows that when the opening degree of both air mix doors 5a, 5c is in the range of 0 degrees to 5 degrees at the temperature on the cold air blowing side of the evaporator, hot water does not flow to the heater core 3 and only the cooling device is operating. In this range, the door 4 is switched to the inside air introduction side. When the opening degree of both air mix doors 5a, 5c reaches 5 degrees or more, hot water begins to flow into the heater core 3, and at the same time, the door 4 is switched to an intermediate position where half of the inside air and half of the outside air are introduced. In this range, a part of the cold air cooled by the air conditioner is heated by the heater core 3, most of the hot air passes through the main hot air passage 8a to the hot air duct 7b, and a part of it passes through the auxiliary hot air passage 8b. and flows into the cold air duct 7a. Then, from the hot air outlet 21, the sub cold air passage 9b
The warm air mixed with a part of the cold air flowing into the hot air duct 7b through the hot air duct 7b is blown out to the feet, and the cold air outlet 20
From there, cold air, which is a mixture of the main cold air flowing into the cold air duct 7a through the main cold air passage 9a and some warm air, is blown out towards the upper body. When the opening degrees of the air mix doors 5a and 5c are small, the amount of cold air flowing into the respective ducts 7a and 7b is large, so the temperature of the cold and hot air blown out from the air outlets 20 and 21 is 10 to 12 degrees and 22 to 23 degrees, respectively. degree. As the opening degree of both air mix doors 5a, 5c increases, the proportion of the amount of cold air heated by the heater core 3 increases, and the amount of cold air flowing into the ducts 7a, 7b decreases, so that the amount of cold and hot air blown out from the outlets 20, 21 increases. The temperature of increases as shown. When the opening degree of both air mix doors 5a, 5c exceeds 25 degrees, the cooling system is stopped and the door 4 is switched to the outside air introduction side. Therefore, when both air mix doors 5a and 5c are controlled in a range of 25 degrees or more, the main and sub-chill air passages 9
Outside air is introduced into a and 9b, and each duct 7a and 7b
Then, warm air and outside air are mixed and blown out from the blow-off ports 20 and 21. Since the amount of outside air at that time is extremely small compared to the amount of hot air, the temperature of the hot air blown out shows a rapid rise as shown in the figure. Note that, if the rotational speed of the blower is constant, the amount of air blown from the cold and hot air outlets 20 and 21 increases as the opening degree of both air mix doors 5a and 5c approaches 0 degrees, and vice versa. The closer the opening degree is to 30 degrees, the larger the air volume of the hot air outlet 21 becomes. In this embodiment, the rotation speed of the blower is set when the opening degree of both air mix doors 5a, 5c is 5 degrees or less and
Maximum when the temperature is 25 degrees or more, minimum between 12.5 degrees and 17.5 degrees, and between 5 degrees and 12.5 degrees and between 17.5 degrees and 25 degrees.
In the range of 12.5 degrees and 17.5 degrees, the rotation speed is configured to gradually decrease as it approaches 17.5 degrees. Therefore, as the opening degree of the doors 5a, 5c approaches 5 degrees, the amount of cold air blown out from the air outlet 20 increases.
As the temperature approaches 25 degrees, the amount of warm air blown out from the air outlet 21 increases, and while achieving the effect of cooling the head and heating the feet, a stronger feeling of cooling and heating can be obtained. Furthermore, as the temperature of the doors 5a and 5b approaches the range of 12.5 degrees to 17.5 degrees, the overall air volume decreases, and in the range of 12.5 degrees to 17.5 degrees, there is a temperature difference (about 15 degrees Celsius) from both the air outlets 20 and 21. A small amount of cold and hot air is blown out, and although the amount of air is small, it is sufficient to cool the head and warm the feet. According to the first invention of the present application, since the second air mix door is controlled according to the control state of the first air mix door, the number of doors is reduced to two without complicating the control mechanism. The temperature difference between the upper and lower air outlets can be controlled to always maintain an appropriate temperature difference. According to the second invention of the present application, the heater core is installed in the duct so that the cold air inflow surface of the heater core and the duct wall surface and the warm air outflow surface of the heater core and the duct wall surface are substantially parallel to each other, and the cold air inflow surface of the heater core and the duct wall surface are arranged in parallel. The first air mix door is installed between the wall and the
Since a second air mix door is installed between the warm air outflow surface of the heater core and the duct wall surface, the temperature of the cold and hot air blown out from the upper and lower outlets can be adjusted over a wide range from low to high temperatures by simply changing the opening degree of both air mix doors. could be controlled over a period of time. Also, even though there are two air mix doors, the volume of the air conditioner does not need to be very large.

[Brief explanation of the drawing]

FIG. 1 is a drawing for explaining the principle of the automobile air conditioner according to the present invention, FIG. 2 is a drawing showing an embodiment of the automobile air conditioner according to the present invention,
FIG. 3 is a drawing showing another embodiment of the automotive air conditioner according to the present invention, and FIG. 4 is a drawing for explaining the cold/hot air control characteristics of the embodiment shown in FIG. DESCRIPTION OF SYMBOLS 1... Blower motor, 2... Evaporator, 3... Heater core, 4... Inside/outside air switching door, 5a... First air mix door, 5b... Control door, 5c... Second air mix door, 7a... Cold air duct, 7b... Warm air duct, 8a... Main Warm air passage, 8b...Sub-hot air passage, 9
a... Main cold air passage, 9b... Sub cold air passage, 20... Upper air outlet, 21... Lower air outlet.

Claims (1)

[Scope of Claims] 1. Two main and sub cold air passages that bypass the heater core, and a main and sub cold air passage that divides the hot air that has passed through the heater core at an appropriate ratio downstream of the heater core.
two auxiliary hot air passages; a first duct means for merging the cold air flowing through the main cold air passage and the warm air flowing through the auxiliary hot air passage to an upper air outlet; and cold air flowing through the auxiliary cold air passage; a second duct means for guiding hot air flowing through the main hot air passage to a lower outlet; and a first duct means for controlling a division ratio between the amount of cold air flowing into the main cold air passage and the amount of cold air flowing into the heater core. an air mix door, and a second door for controlling a mixing ratio between the amount of cold air flowing into the second duct means through the sub-cool air passage and the amount of warm air flowing into the second duct means through the main hot air passage. The air mixing door controls the mixing ratio of the warm air heated by the heater core and the cold air bypassing the heater core to obtain harmonized cold and hot air, and also directs the harmonized cold air from the upper outlet to the upper part of the vehicle interior. In the device having a function of blowing warm air from the lower air outlet to the lower part of the vehicle interior, an upper temperature setting means for setting the interior temperature in the upper part of the vehicle interior, an upper temperature detection means for detecting the interior temperature in the upper part of the vehicle interior; a first control means for controlling the first air mix door so that the difference between the set temperature signal of the upper temperature setting means and the detected temperature signal of the upper temperature detection means is within a predetermined range; a lower temperature setting means for setting an indoor temperature at a lower part of the vehicle interior, a lower temperature detection means for detecting an indoor temperature at a lower part of the vehicle interior, and a difference between a set temperature signal of the lower temperature setting means and a detected temperature signal of the lower temperature detection means is within a predetermined range. and second control means for controlling the second air mix door so that the second air mix door is located inside the air conditioning system. 2. Two main and sub cold air passages that bypass the heater core, and a main and sub cold air passage that divides the hot air that has passed through the heater core at an appropriate ratio downstream of the heater core.
two auxiliary hot air passages; a first duct means for merging the cold air flowing through the main cold air passage and the warm air flowing through the auxiliary hot air passage to an upper air outlet; and cold air flowing through the auxiliary cold air passage; a second duct means for guiding the hot air flowing through the main hot air passage to a lower outlet;
A first control unit that controls a division ratio between the amount of cold air flowing into the main cold air passage and the amount of cold air flowing into the heater core.
an air mix door for controlling a mixing ratio of the amount of cold air flowing into the second duct means through the auxiliary cold air passage and the amount of warm air flowing into the second duct means through the main hot air passage; 2 air mix doors, the mixing ratio of the warm air heated by the heater core and the cold air bypassing the heater core is controlled to obtain harmonized cold air, and the harmonized cold air is directed from the upper air outlet to the upper part of the vehicle interior. The device has a function of blowing warm air downward into the vehicle interior from the lower air outlet, further comprising: a first control mechanism that controls the first air mix door to control the temperature of the air blown out from the air outlet; An air conditioner for an automobile, comprising a second control mechanism that controls the second air mix door according to a control state of the air mix door to control the temperature of the air blown out from the lower air outlet. 3. In the device described in claim 2, there is provided a temperature setting means for setting the temperature inside the vehicle, a temperature detection means for detecting a representative temperature inside the vehicle, a set temperature signal of the temperature setting means, and a temperature setting means for setting the temperature inside the vehicle. a first control mechanism that controls the temperature of the air blown out from the upper air outlet by controlling the first air mix door so that the difference between the temperature signal and the temperature signal detected by the temperature detection means is within a predetermined range; a second air mix door that controls the second air mix door according to a control state of the first air mix door so that a temperature difference between the temperature of the air blown out and the temperature of the air blown out from the upper air outlet has a predetermined relationship; An air conditioner for an automobile characterized by being provided with a control mechanism. 4. In the device described in claim 3, means for generating an electric signal corresponding to the set temperature and means for generating an electric signal corresponding to the indoor temperature are provided, and the electric signal is generated based on at least both electric signals. a first programming means programmed with a calculation flow for calculating the opening degree of the first air mix door; and a calculation unit for calculating the opening degree of the first air mix door from each of the electrical signals according to the program of the first programming means. execution means; a second programming means for programming the second air mix door opening degree corresponding to the first air mix door opening degree; a third program means programmed with a flow for determining the opening degree of the air mix door; a program execution means for determining the opening degree of the second air mix door according to the program of the third program means; and a calculation result of the calculation execution means. and a second operating means that operates the second air mix door based on the result obtained by the program execution means. Features of automotive air conditioning equipment.